期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 28, 期 1, 页码 176-186出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2011.07.063
关键词
High performance mortar; Strength; High temperature; Fracture; Toughness; Three-point bending tests; Notched specimens
An experimental investigation was conducted to evaluate the performance of mortar mixed with silica fume (SF) when exposed to high temperatures. A three-point bending test apparatus was developed to test concrete-like materials at high temperatures. Notched specimens were first heated at a rate of 3.3 degrees C/min to various target temperatures from room temperature to 900 degrees C and then maintained under constant temperature during 2 h. They were then subjected to a three-point bending test while the temperature was held constant. The maximum peak load occurred at 300 degrees C and decreased sharply at higher temperatures. The experimental results demonstrated a noticeable influence of the temperature on the fracture resistance of the high-performance mortar. The toughness parameters, such as intensity factor or fracture energy, evolved nonlinearly with the target temperature, and reached their maximum value at 300 degrees C; at higher temperature, their values decreased considerably. SEM micrographs of the heated specimens after the mechanical tests and cooling and TGA/DTA analysis of the dried material matrix facilitated the understanding of the material's macroscopic behaviour. (C) 2011 Elsevier Ltd. All rights reserved.
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